package com.smallcc.service;

import lombok.extern.slf4j.Slf4j;
import org.simpleframework.xml.core.Commit;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

/**
 * @author 晓风过境
 * @TODO
 * @date 2018/4/4 21:07
 * @day 04
 * @return $text$
 * @title ${CLASS_NAME}
 * @project_name sell
 */
@Component
@Slf4j
public class RedisLock {
    @Autowired
    private StringRedisTemplate redisTemplate;

    /**
     * 当前时间加上超时时间
     * @param key
     * @param value
     * 上锁
     * @return
     */
    public Boolean lock(String key , String value){
        if(redisTemplate.opsForValue().setIfAbsent(key,value)){
            return true;
        }
        String currentValue=redisTemplate.opsForValue().get(key);
        //如果锁过期
        if(!StringUtils.isEmpty(currentValue)&&Long.parseLong(currentValue)<System.currentTimeMillis()){
            //获取上一个锁的时间
            String oldValue = redisTemplate.opsForValue().getAndSet(key, value);
            if(!StringUtils.isEmpty(oldValue)&&oldValue.equals(currentValue)){
                return true;
            }
        }
        return false;
    }
    public void unlock(String key,String value){
        try{
        String currentValue=redisTemplate.opsForValue().get(key);
        if(!StringUtils.isEmpty(currentValue)){
            redisTemplate.opsForValue().getOperations().delete(key);
        }

        }catch (Exception e){
            log.error("[redis分布式锁]解锁异常{}",e);
            e.printStackTrace();
        }

    }
}
